DL 5690 then DL 2919 at Boston
Pittsburgh → Boston → San Francisco
Timetable, Boston time
08:00DL 5690 from Pittsburgh at the gate
20:10DL 2919 to San Francisco leaves the gate
12 h 10 apart on the timetable
DL 2919 leaves 12 h 10 after DL 5690 arrives on the timetable: more than half a day, so not a connection we count.